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2917f74102
We can add const to many parameters, this is for clarity and minor addition to safety. There are some minor effects, in the assembly code and .ko measured on release config. This patch does not cover all possible conversions. Signed-off-by: David Sterba <dsterba@suse.com>
139 lines
5.2 KiB
C
139 lines
5.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#ifndef BTRFS_DISK_IO_H
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#define BTRFS_DISK_IO_H
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#include <linux/sizes.h>
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#include <linux/compiler_types.h>
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#include "ctree.h"
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#include "fs.h"
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struct block_device;
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struct super_block;
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struct extent_buffer;
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struct btrfs_device;
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struct btrfs_fs_devices;
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struct btrfs_fs_info;
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struct btrfs_super_block;
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struct btrfs_trans_handle;
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struct btrfs_tree_parent_check;
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struct btrfs_transaction;
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#define BTRFS_SUPER_MIRROR_MAX 3
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#define BTRFS_SUPER_MIRROR_SHIFT 12
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/*
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* Fixed blocksize for all devices, applies to specific ways of reading
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* metadata like superblock. Must meet the set_blocksize requirements.
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*
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* Do not change.
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*/
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#define BTRFS_BDEV_BLOCKSIZE (4096)
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static inline u64 btrfs_sb_offset(int mirror)
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{
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u64 start = SZ_16K;
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if (mirror)
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return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
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return BTRFS_SUPER_INFO_OFFSET;
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}
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void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info);
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void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
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struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
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struct btrfs_tree_parent_check *check);
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struct extent_buffer *btrfs_find_create_tree_block(
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struct btrfs_fs_info *fs_info,
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u64 bytenr, u64 owner_root,
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int level);
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int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
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int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
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const struct btrfs_super_block *disk_sb);
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int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
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const char *options);
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void __cold close_ctree(struct btrfs_fs_info *fs_info);
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int btrfs_validate_super(const struct btrfs_fs_info *fs_info,
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const struct btrfs_super_block *sb, int mirror_num);
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int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
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int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
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struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
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struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
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int copy_num, bool drop_cache);
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int btrfs_commit_super(struct btrfs_fs_info *fs_info);
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struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
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const struct btrfs_key *key);
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int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_root *root);
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void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
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struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
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u64 objectid, bool check_ref);
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struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
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u64 objectid, dev_t *anon_dev);
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struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
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struct btrfs_path *path,
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u64 objectid);
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int btrfs_global_root_insert(struct btrfs_root *root);
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void btrfs_global_root_delete(struct btrfs_root *root);
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struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
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struct btrfs_key *key);
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struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
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struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
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void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
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void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
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void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
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void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_root *root);
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int btrfs_validate_extent_buffer(struct extent_buffer *eb,
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const struct btrfs_tree_parent_check *check);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
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#endif
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/*
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* This function is used to grab the root, and avoid it is freed when we
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* access it. But it doesn't ensure that the tree is not dropped.
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*
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* If you want to ensure the whole tree is safe, you should use
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* fs_info->subvol_srcu
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*/
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static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
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{
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if (!root)
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return NULL;
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if (refcount_inc_not_zero(&root->refs))
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return root;
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return NULL;
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}
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void btrfs_put_root(struct btrfs_root *root);
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void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
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struct extent_buffer *buf);
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int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
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int atomic);
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int btrfs_read_extent_buffer(struct extent_buffer *buf,
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const struct btrfs_tree_parent_check *check);
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blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
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int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
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struct btrfs_fs_info *fs_info);
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void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
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struct btrfs_fs_info *fs_info);
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struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
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u64 objectid);
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int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
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int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
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int btrfs_init_root_free_objectid(struct btrfs_root *root);
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#endif
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